This is something that federal student loan borrowers are entitled to. Deferment is a temporary suspension of payments on your loans. Though generally you are not charged interest on subsidized loans during your deferment, however, interest does accrue on unsubsidized loans and PLUS loans.

Watch out for skip-a-month offers from your loan servicer: your interest might continue accruing. Depending on the type of loan you have, the federal government might pay your loan’s interest during a deferment period.

Merriam-Webster Online Dictionary
deferment (noun)
the act of delaying or postponing , specifically official postponement of military service